I've written another Stardust tutorial on ActiveTuts+. This time it's about how to create 3D particle effects with Stardust's native 3D engine and Papervision3D.
To combine Stardust with different 3D engines, all you need to do is use a different engine-specific renderer and initializer for particle appearance. It's well explained in the tutorial. So what are you waiting for? Just go check it out!